function [img1] = text_NNK(backcolor)


img1=backcolor*ones(16,25,3);

%N
deb=1;
img1([1:15],repmat(deb,15,1),1:3) = 0.3;
img1([1:3],deb+([1 1 1 ]),1:3) = 0.3;
img1([4:6],deb+([2 2 2 ]),1:3) = 0.3;
img1([7:9],deb+([3 3 3 ]),1:3) = 0.3;
img1([10:12],deb+([4 4 4]),1:3) = 0.3;
img1([1:15],repmat(deb+5,15,1),1:3) = 0.3;

%N
deb=8;
img1([1:15],repmat(deb,15,1),1:3) = 0.3;
img1([1:3],deb+([1 1 1 ]),1:3) = 0.3;
img1([4:6],deb+([2 2 2 ]),1:3) = 0.3;
img1([7:9],deb+([3 3 3 ]),1:3) = 0.3;
img1([10:12],deb+([4 4 4]),1:3) = 0.3;
img1([1:15],repmat(deb+5,15,1),1:3) = 0.3;

%K
deb=15;
img1([1:15],repmat(deb,15,1),1:3) = 0.3;
img1([8:9],deb+([1 1]),1:3) = 0.3;
img1([10:11],deb+([2 2]),1:3) = 0.3;
img1([12:13],deb+([3 3]),1:3) = 0.3;
img1([14:15],deb+([4 4]),1:3) = 0.3;
img1([1:2],deb+([4 4]),1:3) = 0.3;
img1([3:4],deb+([3 3]),1:3) = 0.3;
img1([5:6],deb+([2 2]),1:3) = 0.3;
img1([7:8],deb+([1 1]),1:3) = 0.3;

%:
deb=22;
img1([15 8],[deb deb],1:3) = 0.3;